Water and Dust Resistance: Apple Watch SE and Apple Watch Series 9 have a water resistance rating of 50 meters under ISO standard 22810:2010. This means that they may be used for shallow-water activities like swimming in a pool or ocean.
Apple Watch SE and Apple Watch Series 9 should not be used for scuba diving, waterskiing, or other activities involving high‐velocity water or submersion below shallow depth. Apple Watch Ultra 2 has a water resistance rating of 100 meters under ISO standard 22810 and may be used for high‐speed water sports and recreational scuba diving (with compatible third‐party app from the App Store) to 40 meters. Should not be used for diving below 40 meters. Water resistance is not a permanent condition and can diminish over time. For additional information, see . Apple Watch Series 9 and Apple Watch Ultra are also rated IP6X dust resistant.
Emergency SOS: Emergency SOS requires a cellular connection or Wi-Fi calling with an internet connection from your Apple Watch or nearby iPhone.